Which one of the following does not differ in E. coli and Chlamydomonas

Options

A. Ribosomes
B. Cell wall
C. Cell membrane
D. Nuclear organization

Answer

To solve the question "Which one of the following does not differ in E. coli and Chlamydomonas?", we need to analyze each option provided in the context of the characteristics of these two organisms.

### Step-by-Step Solution:

1. **Identify the Organisms**:
- E. coli is a prokaryotic bacterium.
- Chlamydomonas is a eukaryotic green alga.

2. **Analyze Ribosomes**:
- In E. coli (prokaryote), ribosomes are 70S.
- In Chlamydomonas (eukaryote), ribosomes are 80S.
- **Conclusion**: Ribosomes differ between E. coli and Chlamydomonas.

3. **Analyze Cell Wall**:
- E. coli has a cell wall composed of peptidoglycan.
- Chlamydomonas has a cell wall made of cellulose.
- **Conclusion**: The composition of the cell wall differs between E. coli and Chlamydomonas.

4. **Analyze Cell Membrane**:
- Both E. coli and Chlamydomonas have a cell membrane that consists of a lipid bilayer (phospholipid bilayer).
- **Conclusion**: The cell membrane does not differ between E. coli and Chlamydomonas.

5. **Analyze Nuclear Organization**:
- E. coli has a nucleoid region (no true nucleus).
- Chlamydomonas has a true nucleus.
- **Conclusion**: Nuclear organization differs between E. coli and Chlamydomonas.

6. **Final Conclusion**:
- The only characteristic that does not differ between E. coli and Chlamydomonas is the **cell membrane**.

### Answer:
The correct answer is **cell membrane**.

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